Green Revolution Trebles Human Burden on Planet – Truthdig.
LONDON—Humans are changing not just climate overall, but also the difference between seasons in any given year.
Researchers in the US believe they now know why global warming has begun to announce itself both in annual rises in temperature and in the seasonal records of carbon dioxide in the northern hemisphere—the same seasonal variation in atmospheric chemistry that also contains within it the signature of the Green Revolution and the 20th-century population explosion.
And it’s all because the natural swing from high carbon dioxide levels to low each year has become more dramatic in the last 50 years.
Inexorable pattern
Later in the year, as leaves fall, crops are harvested and consumed, and soil is freshly tilled, most of that CO2 gets back into the atmosphere. It’s an inexorable pattern that follows the seasons.
Systematic measurements of CO2levels began in 1958, and they show that swings within each year from high to low, and back again, have increased in amplitude by 50%, and go on increasing by 0.3% every year.
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